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  • 1
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    Online Resource
    SỰ NỞ HOA CỦA LOÀI VI KHUẨN LAM ĐỘC RAPHIDIOPSIS RACIBORSKII TẠI HỒ BUÔN PHONG, TỈNH ĐẮK LẮK
    Hue University ; 2022
    In:  Hue University Journal of Science: Natural Science Vol. 131, No. 1A ( 2022-03-31), p. 43-49
    Details
    In: Hue University Journal of Science: Natural Science, Hue University, Vol. 131, No. 1A ( 2022-03-31), p. 43-49
    Abstract: Nghiên cứu này điều tra thành phần loài, đặc điểm hình thái, sự biến động mật độ tế bào của vi khuẩn lam (VKL) Raphidiopsis raciborskii và hàm lượng độc tố cylindrospermopsin trong hồ Buôn Phong. Hàm lượng độc tố được xác định bằng phương pháp ELISA. Kết quả cho thấy sự có mặt của 23 loài VKL phân bố trong 10 chi, 5 họ và 3 bộ (Chroococcales, Oscillatoriales, Noctoscales). Raphidiopsis raciborskii tồn tại dưới dạng sợi thẳng, nở hoa quanh năm với số lượng tế bào 53,6 × 106–58,3 × 107 tb/L. Độc tố cylindrospermopsin tồn tại trong suốt 12 tháng nghiên cứu với hàm lượng 0,04–0,72 µg/L. Mặc dù hàm lượng độc tố vẫn nằm dưới mức độ nguy hại (1 µg/L), nhưng sự xuất hiện độc tố trong nước hồ chứa cho thấy rủi ro tiềm tàng do đây là nguồn nước được sử dụng cho sinh hoạt, chăn nuôi và nuôi trồng thủy sản.
    Type of Medium: Online Resource
    ISSN: 2615-9678 , 1859-1388
    URL: Issue
    URL: Article
    DOI: 10.26459/hueunijns.v131i1A
    DOI: 10.26459/hueunijns.v131i1A.6341
    Language: Unknown
    Publisher: Hue University
    Publication Date: 2022
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  • 2
    Online Resource
    Online Resource
    Response to salinity of the submerged aquatic vegetation species \(\textit{Najas indica}\) (Willd.) Cham.
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Marine Science and Technology Vol. 22, No. 1 ( 2022-03-31), p. 29-35
    Details
    In: Vietnam Journal of Marine Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 22, No. 1 ( 2022-03-31), p. 29-35
    Abstract: Najas indica (Willd.) Cham is known as a freshwater species of submerged aquatic vegetation. However, this species is widely distributed in both freshwater and brackish environments. This study examined the survival, growth rate and morphological performance of N. indica collected from the Cau Hai lagoon (Thua Thien Hue) against different salinity treatments in a mesocosm experiment to determine the optimal salinity for the species. The results showed significant effects of different salinities on survival rates, growth, biomass, and the morphological characteristics of N. indica. The species could survive and continue growing at 0–15 ppt but died completely at 20 ppt and 25 ppt after the first week of the 8-week experiment. Leaf length tended to be shorter in higher salinity. Shoot length, the number of internodes and branches per shoot, biomass reached the highest values at 5 ppt and 10 ppt. These suggested that the optimal salinity of the N. indica was at a range of 5–10 ppt. Study results were informative to explain the distribution change of the freshwater originated hydrophyte N. indica in lagoon environments in Vietnam.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/16072
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 3
    Online Resource
    Online Resource
    Cyanobacterium Raphidiopsis raciborskii and its toxin in Buon Phong reservoir, Dak Lak province, Vietnam
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Earth Sciences ( 2022-03-15)
    Details
    In: Vietnam Journal of Earth Sciences, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), ( 2022-03-15)
    Abstract: This study investigated the variation of the cyanobacterium Raphidiopsis raciborskii population under the influence of physicochemical parameters from May 2019 to April 2020 in the Buon Phong reservoir. The correlations between these parameters were explored by using Principal Component Analysis (PCA) and Pearson correlation analysis. The cylindrospermopsin (CYN) toxin in isolated strains from the reservoir was confirmed by using High-performance liquid chromatography (HPLC) analyses. R. raciborskii presented throughout the year in the reservoir with a biovolume from 0.12 to 9.14 mm3 L-1. Four R. raciborskii strains (CBP2, CBP3, CBP4, and CBP5) were successfully isolated and confirmed to produce CYN by the HPLC results. The highest concentration in isolated strains was 0.345 μg g-1 DW in the CBP4 strain. The PCR results of genes responsible for CYN biosynthesis showed that the PCR amplicons of cyrB and CyrC were amplified in two toxic strains (CBP2 and CBP3), while the amplicons of both cyrB and cyrC were not observed in two remaining toxic strains. In addition, such abiotic factors as temperature and nutrients played major roles in the abundance of R. raciborskii. Moreover, the biovolume of R. raciborskii positively correlated with the CYN concentrations in the Buon Phong reservoir.
    Type of Medium: Online Resource
    ISSN: 2615-9783 , 2615-9783
    URL: Article
    DOI: 10.15625/2615-9783/16997
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 4
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    Online Resource
    Cellular and body scale morphology of Heterocapsa huensis sp. nov. (Peridiniales, Dinophyceae) found in Hue, Vietnam
    Wiley ; 2009
    In:  Phycological Research Vol. 57, No. 2 ( 2009-06), p. 87-93
    Details
    In: Phycological Research, Wiley, Vol. 57, No. 2 ( 2009-06), p. 87-93
    Abstract: Cellular and body scale structure of a new armored dinoflagellate Heterocapsa huensis , collected from Hue, Vietnam were investigated. Morphology of motile cell was observed by light, fluorescent and scanning electron microscopy, and body scale structure was examined by whole mounts of transmission electron microscopy. Cells of H. huensis were ellipsoid with a spherical nucleus located in the posterior and multiple pyrenoids located above the nucleus; this arrangement was similar to that of Heterocapsa pygmaea . Transmission electron microscopy revealed ultrastructure of the body scales consisted of a rounded triangular basal plate and three‐dimensional ornaments. Structure of the basal plate resembles that of Heterocapsa illdefina ; however, the number of the peripheral spine is different from that of H. illdefina and this structure has never been reported from Heterocapsa species. A new Heterocapsa species, H. huensis Iwataki et Matsuoka sp. nov., is described based on positions of organelles and body scale ultrastructure.
    Type of Medium: Online Resource
    ISSN: 1322-0829 , 1440-1835
    URL: Issue
    URL: Article
    DOI: 10.1111/pre.2009.57.issue-2
    DOI: 10.1111/j.1440-1835.2009.00524.x
    Language: English
    Publisher: Wiley
    Publication Date: 2009
    detail.hit.zdb_id: 2020835-2
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Effects of salinity on seedling gemination and growth of early seedlings of the \(\textit{Najas indica}\) (Willd.) Cham.
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Marine Science and Technology Vol. 22, No. 2 ( 2022-06-21), p. 199-207
    Details
    In: Vietnam Journal of Marine Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 22, No. 2 ( 2022-06-21), p. 199-207
    Abstract: Najas indica (Willd.) Cham. is a freshwater submerged aquatic vegetation. N. indica is an annual plant. Therefore, seeds in the sediment and the survival and growth of seedlings play an important role in re-establishing new populations of the species. The purpose of this study was to determine the seed density in the sediment, examine the effect of salinity on seedling germination from seeds, and assess the impact of the salinity on the growth of early seedlings of N. indica under the experimental condition. The seed density of N. indica was highest from September to November and the lowest in May to July 2018. Seedlings of the species were observed in the range of salinity from 0–15‰. No seedling was recorded at 20‰ salinity during the experimental period. The number of seedlings, growth rate, shoot length, and the number of internodes of seedlings of N. indica, all had maximum values at a salinity of 5‰, while leaf length tended to decrease with increasing salinity. The study showed that the optimum salinity for seedling germination from seeds and growth of seedlings of N. indica species from the Cau Hai lagoon was at 5‰ salinity. The study results supply the necessary information for the protection and development of meadows of the N. indica species in the lagoon environment of Vietnam.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/17075
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 6
    Online Resource
    Online Resource
    Morphological and distribution characteristics of \(\textit{Halophila beccarii}\) Aschers., 1871 in the Cau Hai lagoon, Thua Thien Hue province, Vietnam
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Marine Science and Technology Vol. 22, No. 3 ( 2022-08-19)
    Details
    In: Vietnam Journal of Marine Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 22, No. 3 ( 2022-08-19)
    Abstract: Halophila beccarii Aschers., 1871 was one of the seagrass species that was vulnerable and threatened list by the International Union for Conservation of Nature (IUCN). During the survey period from March 2018 to September 2019, our results showed that H. beccarii was widely distributed in the Cau Hai lagoon and concentrated mainly in the Southeast area of the lagoon. The distribution of H. beccarii was seasonal. The species’ growth started from the early rainy season of the previous year until the end of the dry season of the following year. However, the period when the species had a high cover, biomass, and shoot density was from September 2018 to March 2019, and those values peaked in January 2019. The lowest cover and shoot density were recorded in November 2019, while the lowest biomass was in July 2019. The rainfall had a close positive correlation with the biomass of H. beccarii, while water salinity and water temperature were moderate negatively correlated with the biomass of the species.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/17093
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 7
    Online Resource
    Online Resource
    Growth and morphological responses of Halophila beccarii to low salinity
    Hue University ; 2022
    In:  Hue University Journal of Science: Natural Science Vol. 131, No. 1B ( 2022-06-30), p. 47-57
    Details
    In: Hue University Journal of Science: Natural Science, Hue University, Vol. 131, No. 1B ( 2022-06-30), p. 47-57
    Abstract: Halophila beccarii Ascherson is classified as a threatened seagrass species by IUCN because of the reductive tendency of ​​its distribution area. This seagrass is considered a euryhaline species adapted to a wide range of salinities from freshwater and brackish water to marine water. Previous studies showed that the species tends to grow better under low salinity; however, its optimum salinity has not been determined. In Vietnam, H. beccarii grows in habitats with low salinity (0–20 ppt). The results show that salinity affects the growth, survival rate, shoot density, biomass, and morphological characteristics of the grass. The leaf dimension is more prolonged and broader; the petiole and shoot length are longer at 10 ppt salinity. In contrast, both the number of shoots and biomass peak at 5 ppt and decrease at lower and higher salinities. The study reveals that H. beccarii can grow better under mesohaline conditions than freshwater and hypersaline conditions with an optimum salinity at 5–10 ppt. These findings would explain the species’ distribution dynamics in coastal environments and be helpful information for conserving the seagrass populations in habitats with fluctuating salinity as coastal lagoons in Central Vietnam.
    Type of Medium: Online Resource
    ISSN: 2615-9678 , 1859-1388
    URL: Issue
    URL: Article
    DOI: 10.26459/hueunijns.v131i1B
    DOI: 10.26459/hueunijns.v131i1B.6452
    Language: Unknown
    Publisher: Hue University
    Publication Date: 2022
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  • 8
    Online Resource
    Online Resource
    Blue shift in the luminescence spectra of MEH-PPV films containing ZnO nanoparticles
    Elsevier BV ; 2008
    In:  Journal of Luminescence Vol. 128, No. 12 ( 2008-12), p. 2031-2034
    Details
    In: Journal of Luminescence, Elsevier BV, Vol. 128, No. 12 ( 2008-12), p. 2031-2034
    Type of Medium: Online Resource
    ISSN: 0022-2313
    URL: Article
    DOI: 10.1016/j.jlumin.2008.07.004
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2008
    detail.hit.zdb_id: 1491401-3
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  • 9
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    ĐẶC ĐIỂM HÌNH THÁI VÀ PHÂN BỐ CỦA LOÀI RONG CÁM NAJAS INDICA (WILD.) CHAM. Ở ĐẦM CẦU HAI, TỈNH THỪA THIÊN HUẾ
    Hue University ; 2020
    In:  Hue University Journal of Science: Natural Science Vol. 129, No. 1A ( 2020-03-20), p. 107-114
    Details
    In: Hue University Journal of Science: Natural Science, Hue University, Vol. 129, No. 1A ( 2020-03-20), p. 107-114
    Abstract: Bài báo trình bày kết quả nghiên cứu đặc điểm hình thái và phân bố của loài rong cám Najas indica ở đầm Cầu Hai trong khoảng thời gian từ tháng 3/2018 đến 3/2019. N. indica có phân bố khá rộng ở đầm Cầu Hai, từ khu vực giữa đầm hướng vào bờ phía Tây, có mặt ở 10/21 điểm khảo sát. Độ phủ và sinh khối của N. indica có sự khác biệt ở các tháng khảo sát. Độ phủ và sinh khối của rong bắt đầu gia tăng từ tháng 4. Độ phủ cao nhất đạt được trong khoảng thời gian từ tháng 7 đến 11 (49,33 ± 15,05%÷52,60 ± 12,28%) và sinh khối đạt cực đại vào tháng 7 (93,61 ± 35,60 g/m²); sau đó giảm dần. Độ mặn và nhiệt độ không khí thể hiện sự ảnh hưởng đến biến động phân bố của N. indica ở đầm Cầu Hai, trong đó, nhiệt độ không khí có mối tương quan chặt với sinh khối còn độ mặn chỉ thể hiện tương quan yếu với sinh khối và độ phủ của loài.
    Type of Medium: Online Resource
    ISSN: 2615-9678 , 1859-1388
    URL: Issue
    URL: Article
    DOI: 10.26459/hueuni-jns.v129i1A
    DOI: 10.26459/hueuni-jns.v129i1A.5638
    Language: Unknown
    Publisher: Hue University
    Publication Date: 2020
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  • 10
    Online Resource
    Online Resource
    Enhanced photoluminescence of polyfluorene by incorporation of Al-doped ZnO nanoparticles
    Elsevier BV ; 2013
    In:  Thin Solid Films Vol. 538 ( 2013-07), p. 85-88
    Details
    In: Thin Solid Films, Elsevier BV, Vol. 538 ( 2013-07), p. 85-88
    Type of Medium: Online Resource
    ISSN: 0040-6090
    URL: Article
    DOI: 10.1016/j.tsf.2012.12.087
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2013
    detail.hit.zdb_id: 1482896-0
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